EP4177604A1 - Verfahren und system zur bestimmung der qualität eines geschlossenzelligen schaums in bezug auf wärmedämmung - Google Patents

Verfahren und system zur bestimmung der qualität eines geschlossenzelligen schaums in bezug auf wärmedämmung Download PDF

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Publication number
EP4177604A1
EP4177604A1 EP21207259.9A EP21207259A EP4177604A1 EP 4177604 A1 EP4177604 A1 EP 4177604A1 EP 21207259 A EP21207259 A EP 21207259A EP 4177604 A1 EP4177604 A1 EP 4177604A1
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EP
European Patent Office
Prior art keywords
sensor
foam
value
carbon dioxide
dioxide concentration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21207259.9A
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English (en)
French (fr)
Inventor
Jürgen Kress
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brugg Rohr AG Holding
Original Assignee
Brugg Rohr AG Holding
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brugg Rohr AG Holding filed Critical Brugg Rohr AG Holding
Priority to EP21207259.9A priority Critical patent/EP4177604A1/de
Publication of EP4177604A1 publication Critical patent/EP4177604A1/de
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/44—Resins; Plastics; Rubber; Leather
    • G01N33/445—Rubber
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • G01N33/004—CO or CO2

Definitions

  • the invention relates to a method for determining the quality of a closed cell foam with respect to its thermal insulation, a system for carrying out the method and a thermally insulated pipe according to the independent claims.
  • the invention can also be used for the detection of a leakage which might occur over time.
  • the insulating foam is surrounded by a polyethylene jacket.
  • a change in the ⁇ -value of the cell gas mixture can indicate such a damage afterwards and the respective pipe can be replaced.
  • the sensor according to the invention may be identical for both parameters.
  • An example for such a sensor by means of which both parameters are obtainable is given below. Therefore, in instances where multiple sensors are used, which will be described in the course of the following text, it is conceivable to use multiple sensors of which one or more may be used for obtaining one of said parameters and the other sensor(s) are used for obtaining the other parameter.
  • the characteristic parameter is not limited to the two enumerated parameters. For example, humidity may be another valid parameter for the purposes of the invention.
  • the sensing element is encapsulated in a diffusion-open casing.
  • this allows gas to be analyzed to access the sensing element but at the same time protects the sensing element from contamination with solid particles like foam particles produced during the insertion of the sensor into the foam or with dust.
  • the transient hot wire measurement method is used to measure the thermal conductivity by measuring a temperature gradient at a certain distance from a heated element.
  • a description of this method can be found at https://www.tec-science.com/thermodynamics/heat/transient-hot-wire-method-method-for-determining-thermal-conductivity-thw.
  • the advantage is that the measurements are fast as compared to other methods.
  • the transient line source method is used to measure the thermal conductivity by measuring a temperature gradient, where a suitable sensor and a heated element are arranged in a same rod.
  • a description of this method can be found at https://thermtest.com/tls-100.
  • An advantage of this method is the small size of the sensor arrangement as compared to other methods, while yielding a measurement result within ca. 1 min.
  • replacement value is understood in general as a value used for the quality assessment which was not directly measured but derived from a directly measured value.
  • the heat conductivity starts at the level of about 26 mW/m*K because of the outside air introduced into the hole during insertion of the sensor package.
  • the heat conductivity drops over time, as does the relative humidity.
  • the apparent CO 2 -concentration is increasing.
  • the explanation for that is as follows:
  • the sensor STC31 is commercially available and used for the detection of the CO 2 concentration in air. Air has a ⁇ -value of 26 mW/m*K, CO 2 has a ⁇ -value of 16 mW/m*K.
  • a decreasing heat conductivity is interpreted as an increasing CO 2 concentration because only CO 2 with its low heat conductivity can explain that outcome within the logical framework of the algorithm.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
EP21207259.9A 2021-11-09 2021-11-09 Verfahren und system zur bestimmung der qualität eines geschlossenzelligen schaums in bezug auf wärmedämmung Pending EP4177604A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21207259.9A EP4177604A1 (de) 2021-11-09 2021-11-09 Verfahren und system zur bestimmung der qualität eines geschlossenzelligen schaums in bezug auf wärmedämmung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21207259.9A EP4177604A1 (de) 2021-11-09 2021-11-09 Verfahren und system zur bestimmung der qualität eines geschlossenzelligen schaums in bezug auf wärmedämmung

Publications (1)

Publication Number Publication Date
EP4177604A1 true EP4177604A1 (de) 2023-05-10

Family

ID=78820881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21207259.9A Pending EP4177604A1 (de) 2021-11-09 2021-11-09 Verfahren und system zur bestimmung der qualität eines geschlossenzelligen schaums in bezug auf wärmedämmung

Country Status (1)

Country Link
EP (1) EP4177604A1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2091880A (en) * 1981-01-22 1982-08-04 Insapipe Ind Ltd Water penetration sensor for thermally insulated conduits
US20070235440A1 (en) * 2006-04-05 2007-10-11 Youfan Gu Multiple heater control system with expandable modular functionality
US20090115433A1 (en) * 2005-07-13 2009-05-07 Gunther Bier Method for Locating Leaks In Pipes
JP2009281908A (ja) * 2008-05-23 2009-12-03 Panasonic Corp 熱物性測定装置
US20130085708A1 (en) * 2011-09-30 2013-04-04 Drager Medical Gmbh Device and process for determining the body core temperature
US20190234903A1 (en) * 2018-02-01 2019-08-01 Ppg Industries Ohio, Inc. Complex impedance moisture sensor and sensing method
KR102287882B1 (ko) * 2020-02-26 2021-08-09 부산대학교 산학협력단 극저온 유체 단열 저장 시스템의 성능시험 장치 및 방법

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2091880A (en) * 1981-01-22 1982-08-04 Insapipe Ind Ltd Water penetration sensor for thermally insulated conduits
US20090115433A1 (en) * 2005-07-13 2009-05-07 Gunther Bier Method for Locating Leaks In Pipes
US20070235440A1 (en) * 2006-04-05 2007-10-11 Youfan Gu Multiple heater control system with expandable modular functionality
JP2009281908A (ja) * 2008-05-23 2009-12-03 Panasonic Corp 熱物性測定装置
US20130085708A1 (en) * 2011-09-30 2013-04-04 Drager Medical Gmbh Device and process for determining the body core temperature
US20190234903A1 (en) * 2018-02-01 2019-08-01 Ppg Industries Ohio, Inc. Complex impedance moisture sensor and sensing method
KR102287882B1 (ko) * 2020-02-26 2021-08-09 부산대학교 산학협력단 극저온 유체 단열 저장 시스템의 성능시험 장치 및 방법

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